case TTT_ERROR_COMMAND:
return "ERROR COMMAND\r\n";
case TTT_ERROR_SYNTAX:
return "ERROR SYNTAX\r\n";
case TTT_ERROR_NOT_NUMBER:
case TTT_ERROR_COMMAND:
return "ERROR COMMAND\r\n";
case TTT_ERROR_SYNTAX:
return "ERROR SYNTAX\r\n";
case TTT_ERROR_NOT_NUMBER: